What happens if you add tap water to a car?

[DeWalker]

Adding tap water to a car can have the following effects: 1. The engine and its cooling system are made of metal, including copper, iron, aluminum, steel, and solder. These metals, when exposed to water under high temperatures over time, can corrode and rust. 2. The boiling point of water is 100 degrees Celsius. During summer use, when the engine operates at higher temperatures, adding tap water can easily lead to boiling. 3. The most troublesome issue with using water as a coolant is the problem of scale. Scale deposits on the metal surfaces of the radiator and water jacket, which increasingly reduces cooling efficiency and is difficult to remove.